Hi,
it might be posible that your carb heat is not in a proper condition. i think it does not completly close the airflow from the filter and so you have two airstreams in carb direction (this increases cyl filling)
That also means that you not have full carb-deicing capabilities in a case were you really need it.
so please - contact an engineer before your next takeoff.
mhl
Kilodelta
